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using System;
using System.Collections.Generic;
using System.Linq;
using XenAdmin.Core;
using XenAdmin.Wizards.GenericPages;
using XenAPI;

namespace XenAdmin.Wizards.CrossPoolMigrateWizard.Filters
{
    internal class WlbEnabledFilter : ReasoningFilter
    {
        private readonly List<VM> preSelectedVMs;

        public WlbEnabledFilter(IXenObject item, List<VM> preSelectedVMs)
            : base(item)
        {
            if (preSelectedVMs == null)
                throw new ArgumentNullException("Pre-selected VMs are null");
            this.preSelectedVMs = preSelectedVMs;
        }

        public override bool FailureFoundFor(IXenObject itemToFilterOn)
        {
            bool targetWlb = false;

            if(itemToFilterOn != null)
                targetWlb = Helpers.CrossPoolMigrationRestrictedWithWlb(itemToFilterOn.Connection);

            bool sourceWlb = preSelectedVMs.Any(vm => Helpers.CrossPoolMigrationRestrictedWithWlb(vm.Connection));

            reason = targetWlb ? Messages.CPM_WLB_ENABLED_ON_HOST_FAILURE_REASON : Messages.CPM_WLB_ENABLED_ON_VM_FAILURE_REASON;

            return targetWlb || sourceWlb;
        }

        private string reason = Messages.UNKNOWN;

        public override string Reason { get { return reason; } }
    }
}
